US6262683B1ExpiredUtility

Circularly polarized wave antenna and wireless apparatus

50
Assignee: MURATA MANUFACTURING COPriority: Jun 16, 1999Filed: Mar 21, 2000Granted: Jul 17, 2001
Est. expiryJun 16, 2019(expired)· nominal 20-yr term from priority
Inventors:Kazunari KawahataShigekazu Itoh
H01Q 1/38H01Q 9/0435H01Q 9/0407
50
PatentIndex Score
8
Cited by
3
References
22
Claims

Abstract

A circularly polarized wave antenna for transmitting/receiving circularly polarized radio waves by a radiative electrode disposed on a dielectric member, wherein: the dielectric member is substantially cylindrical; the radiative electrode has a substantially circular shape, which is similar to the shape of a top surface of the dielectric member, and is disposed on the top surface of the dielectric member; a spacing between an outer peripheral edge of the top surface of the dielectric member and an edge of the radiative electrode is formed so as to be substantially the same around the entirety of the outer peripheral edge of the dielectric member; the circularly polarized wave antenna excites a higher mode; and a feed electrode, which supplies electrical power to said radiative electrode by capacitive coupling, is disposed on a side of the dielectric member.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
       1. A circularly polarized wave antenna for transmitting/receiving circularly polarized radio waves by a radiative electrode disposed on a dielectric member, wherein: 
       said dielectric member is substantially cylindrical; said radiative electrode has a substantially circular shape, which is similar to a shape of a top surface of said dielectric member, and is disposed on the top surface of said dielectric member;  
       a spacing between an outer peripheral edge of the top surface of said dielectric member and an edge of said radiative electrode is formed so as to be substantially the same around the entirety of the outer peripheral edge of said dielectric member; and  
       a feed electrode, which supplies electrical power to said radiative electrode by capacitive coupling, is disposed on a side of said dielectric member.  
     
     
       2. The circularly polarized wave antenna of claim  1 , wherein: a feed-electrode-disposing region on the side of said dielectric member is formed to be planar; and said feed electrode is disposed on the plane. 
     
     
       3. The circularly polarized wave antenna of claim  2 , wherein a plurality of feed electrodes are disposed on the plane. 
     
     
       4. The circularly polarized wave antenna of claim  1  wherein a plurality of feed electrodes are provided. 
     
     
       5. The circularly polarized wave antenna of claim  1 , wherein: the edge of said radiative electrode is disposed inside the outer peripheral edge of the top surface of said dielectric member; and said feed electrode is disposed in a region between the outer peripheral edge of said dielectric member and the edge of said radiative electrode on the top surface of said dielectric member while being separated from said radiative electrode. 
     
     
       6. The circularly polarized wave antenna of claim  2 , wherein: the edge of said radiative electrode is disposed inside the outer peripheral edge of the top surface of said dielectric member; and said feed electrode is disposed in a region between the outer peripheral edge of said dielectric member and the edge of said radiative electrode on the top surface of said dielectric member while being separated from said radiative electrode. 
     
     
       7. The circularly polarized wave antenna of claim  3 , wherein: the edge of said radiative electrode is disposed inside the outer peripheral edge of the top surface of said dielectric member; and said feed electrode is disposed in a region between the outer peripheral edge of said dielectric member and the edge of said radiative electrode on the top surface of said dielectric member while being separated from said radiative electrode. 
     
     
       8. The circularly polarized wave antenna of claim  4 , wherein: the edge of said radiative electrode is disposed inside the outer peripheral edge of the top surface of said dielectric member; and said feed electrode is disposed in a region between the outer peripheral edge of said dielectric member and the edge of said radiative electrode on the top surface of said dielectric member while being separated from said radiative electrode. 
     
     
       9. The circularly polarized wave antenna of claim  1 , wherein the feed electrode is disposed on the side of the dielectric member and extends onto a bottom surface of the dielectric member. 
     
     
       10. The circularly polarized wave antenna of claim  1  wherein the feed electrode is disposed on the side and top and bottom surfaces of the dielectric member. 
     
     
       11. The circularly polarized wave antenna of claim  1 , wherein said antenna has a fundamental mode and excites a mode higher than the fundamental mode. 
     
     
       12. The wireless apparatus of claim  1 , wherein said antenna has a fundamental mode and excites a mode higher than the fundamental mode. 
     
     
       13. A wireless apparatus comprising a circularly polarized wave antenna, the antenna for transmitting/receiving circularly polarized radio waves by a radiative electrode disposed on a dielectric member, wherein: 
       said dielectric member is substantially cylindrical; said radiative electrode has a substantially circular shape, which is similar to a shape of a top surface of said dielectric member, and is disposed on the top surface of said dielectric member;  
       a spacing between an outer peripheral edge of the top surface of said dielectric member and an edge of said radiative electrode is formed so as to be substantially the same around the entirety of the outer peripheral edge of said dielectric member; and  
       a feed electrode, which supplies electrical power to said radiative electrode by capacitive coupling, is disposed on a side of said dielectric member.  
     
     
       14. The wireless apparatus of claim  13  further wherein, a feed-electrode-disposing region on the side of said dielectric member is formed to be planar; and said feed electrode is disposed on the plane. 
     
     
       15. The wireless apparatus of claim  14  further wherein a plurality of feed electrodes are disposed on the plane. 
     
     
       16. The wireless apparatus of claim  13 , wherein a plurality of feed electrodes are provided. 
     
     
       17. The wireless apparatus of claim  13  further wherein: the edge of said radiative electrode is disposed inside the outer peripheral edge of the top surface of said dielectric member; and said feed electrode is disposed in a region between the outer peripheral edge of said dielectric member and the edge of said radiative electrode on the top surface of said dielectric member while being separated from said radiative electrode. 
     
     
       18. The wireless apparatus of claim  14  further wherein: the edge of said radiative electrode is disposed inside the outer peripheral edge of the top surface of said dielectric member; and said feed electrode is disposed in a region between the outer peripheral edge of said dielectric member and the edge of said radiative electrode on the top surface of said dielectric member while being separated from said radiative electrode. 
     
     
       19. The wireless apparatus of claim  15  further wherein: the edge of said radiative electrode is disposed inside the outer peripheral edge of the top surface of said dielectric member; and said feed electrode is disposed in a region between the outer peripheral edge of said dielectric member and the edge of said radiative electrode on the top surface of said dielectric member while being separated from said radiative electrode. 
     
     
       20. The wireless apparatus of claim  16  further wherein: the edge of said radiative electrode is disposed inside the outer peripheral edge of the top surface of said dielectric member; and said feed electrode is disposed in a region between the outer peripheral edge of said dielectric member and the edge of said radiative electrode on the top surface of said dielectric member while being separated from said radiative electrode. 
     
     
       21. The wireless apparatus of claim  13 , wherein the feed electrode is disposed on the side of the dielectric member and extends onto a bottom surface of the dielectric member. 
     
     
       22. The wireless apparatus of claim  13  wherein the feed electrode is disposed on the side and top and bottom surfaces of the dielectric member.

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